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Howell's violet, violette de Howell

Utah violet

Habit Plants perennial, caulescent, not stoloniferous, 2–44 cm. Plants perennial, caulescent, not stoloniferous, 5–20 cm.
Stems

1–4, ascending to erect (sometimes later reclining to nearly prostrate), glabrous or sparsely pubescent, on caudex from subligneous rhizome.

1–4, prostrate, decumbent, or erect, leafy proximally and distally, glabrate or sparsely puberulent, on caudex from subligneous rhizome.

Leaves

basal and cauline;

basal: 1–6;

stipules linear-lanceolate to oblong, margins mostly entire or laciniate with gland-tipped projections, apex acute to acuminate;

petiole 4–15 cm, glabrous or sparsely puberulent;

blade ovate to reniform, 1.9–6.8 × 2.1–6.4 cm, thin, base cordate, margins crenate, ciliate, apex acute to usually obtuse, surfaces glabrous or sparsely puberulent;

cauline similar to basal except: stipules linear-lanceolate or deltate to oblong, apex acute or long-acuminate;

petiole 1–4.5 cm;

blade 2–5.1 × 1.2–5.8 cm.

basal and cauline;

basal: 1–3;

stipules adnate to petiole, forming 2 linear-lanceolate wings, margins entire or laciniate with glandular hairs, apex of each wing free, acute, sometimes divided into several filiform processes;

petiole 2–8(–12) cm, glabrate or sparsely puberulent;

blade usually broadly ovate, sometimes ± orbiculate, 1–4.5 × 0.7–3.4 cm, base usually attenuate, rarely truncate or subcordate, margins ± coarsely crenate-serrate, ciliate, apex obtuse, surfaces glabrate or sparsely puberulent;

cauline similar to basal except: stipules lanceolate or linear-lanceolate to linear, margins ± entire or lacerate to laciniate with sparse gland-tipped projections, apex acute to acuminate, often divided into 2–4 filiform processes;

petiole 3–8.7 cm;

blade ovate to oblong-ovate or oblong-lanceolate, 0.7–1.6 × 2.6–3.7 cm, margins shallowly serrate, irregularly crenate, or ± entire, apex acute to obtuse.

Peduncles

2.8–17.8 cm, glabrous or sparsely pubescent.

4–10 cm, glabrate or sparsely puberulent.

Flowers

sepals lanceolate, margins ciliate or eciliate, auricles 1–2 mm;

petals violet to soft blue-violet on both surfaces, whitish basally, lower 3 dark violet-veined, lateral 2 densely bearded, lowest 14–23 mm, spur blue-violet to whitish, gibbous to elongated, 2.4–5 mm, usually less than 1/2 lowest petal, tip straight;

style head bearded; cleistogamous flowers axillary.

sepals lanceolate, margins ciliate or eciliate, auricles 1–1.5 mm;

petals deep lemon-yellow adaxially, upper 2 and sometimes lateral 2 reddish brown to brownish purple abaxially, lower 3 and sometimes upper 2 dark brown-veined, lateral 2 sparsely bearded, lowest 10–13 mm, spur yellow, gibbous, 0.5–1.5 mm;

style head bearded; cleistogamous flowers axillary.

Capsules

ellipsoid, 7–11 mm, glabrous.

± spherical, 6–7 mm, glabrous or finely puberulent.

Seeds

light brown, 2.1–2.8 mm.

brown, ca. 3 mm.

2n

= 40, 80.

= 24.

Viola howellii

Viola utahensis

Phenology Flowering Apr–Jul. Flowering May.
Habitat Moist, shady areas, coniferous forests, prairies, along streams Open sagebrush areas, semidesert slopes, grasslands, open forests
Elevation 50–1500 m (200–4900 ft) 1200–2600 m (3900–8500 ft)
Distribution
from FNA
CA; OR; WA; BC
[WildflowerSearch map]
[BONAP county map]
from FNA
CO; ID; NV; UT; WY
[WildflowerSearch map]
[BONAP county map]
Discussion

Viola howellii is similar to V. adunca and usually occupies moister habitats along the western side of the Cascade Mountains (H. E. Ballard 1992). The first documented record of this species in California was recently reported from Siskiyou County (R. J. Little 2010).

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Viola utahensis occurs only in areas where its closest relatives, V. vallicola and V. purpurea var. venosa, are also found and it appears to have originated from the crossing of those taxa followed by a doubling of the chromosomes (M. S. Baker 1949). The elaiosome of V. utahensis seeds has the same general appearance as those of other members of V. purpurea complex (except V. purpurea var. venosa), covering about one-third the length of the seed. G. Davidse (1976) found that tetraploid members of Clausen’s “subsect.” Purpurea (V. utahensis) have serrate leaf margins; diploid plants (V. purpurea) have crenate leaf margins. He also found that the size of V. utahensis plants is correlated with elevation, the largest plants at low elevations and the smallest at higher elevations.

G. Davidse (1976) reported putative hybrids between Viola utahensis and V. praemorsa subsp. major (= var. linguifolia), V. purpurea var. venosa, and V. beckwithii.

Observed pollinators of Viola utahensis in Utah include the bees Apis mellifera Linnaeus and Anthophora ursina Cresson (G. Davidse 1976). In other populations, flies in the genera Eristalis Latreille and Bombylius Linnaeus were observed indiscriminately visiting the yellow-flowered species V. praemorsa subsp. major, V. utahensis, and V. vallicola (Davidse).

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Source FNA vol. 6, p. 134. FNA vol. 6, p. 162.
Parent taxa Violaceae > Viola Violaceae > Viola
Sibling taxa
V. adunca, V. affinis, V. arvensis, V. bakeri, V. beckwithii, V. bicolor, V. biflora, V. blanda, V. brittoniana, V. canadensis, V. canina, V. charlestonensis, V. clauseniana, V. cucullata, V. cuneata, V. douglasii, V. egglestonii, V. epipsila, V. flettii, V. frank-smithii, V. glabella, V. guadalupensis, V. hallii, V. hastata, V. hirsutula, V. japonica, V. labradorica, V. lanceolata, V. langsdorffii, V. lithion, V. lobata, V. macloskeyi, V. missouriensis, V. nephrophylla, V. novae-angliae, V. nuttallii, V. ocellata, V. odorata, V. orbiculata, V. palmata, V. palustris, V. pedata, V. pedatifida, V. pedunculata, V. pinetorum, V. praemorsa, V. primulifolia, V. prionantha, V. pubescens, V. purpurea, V. quercetorum, V. renifolia, V. riviniana, V. rostrata, V. rotundifolia, V. sagittata, V. selkirkii, V. sempervirens, V. septemloba, V. sheltonii, V. sororia, V. striata, V. subsinuata, V. tomentosa, V. tricolor, V. trinervata, V. tripartita, V. umbraticola, V. utahensis, V. vallicola, V. villosa, V. walteri
V. adunca, V. affinis, V. arvensis, V. bakeri, V. beckwithii, V. bicolor, V. biflora, V. blanda, V. brittoniana, V. canadensis, V. canina, V. charlestonensis, V. clauseniana, V. cucullata, V. cuneata, V. douglasii, V. egglestonii, V. epipsila, V. flettii, V. frank-smithii, V. glabella, V. guadalupensis, V. hallii, V. hastata, V. hirsutula, V. howellii, V. japonica, V. labradorica, V. lanceolata, V. langsdorffii, V. lithion, V. lobata, V. macloskeyi, V. missouriensis, V. nephrophylla, V. novae-angliae, V. nuttallii, V. ocellata, V. odorata, V. orbiculata, V. palmata, V. palustris, V. pedata, V. pedatifida, V. pedunculata, V. pinetorum, V. praemorsa, V. primulifolia, V. prionantha, V. pubescens, V. purpurea, V. quercetorum, V. renifolia, V. riviniana, V. rostrata, V. rotundifolia, V. sagittata, V. selkirkii, V. sempervirens, V. septemloba, V. sheltonii, V. sororia, V. striata, V. subsinuata, V. tomentosa, V. tricolor, V. trinervata, V. tripartita, V. umbraticola, V. vallicola, V. villosa, V. walteri
Name authority A. Gray: Proc. Amer. Acad. Arts 22: 308. (1887) M. S. Baker & J. C. Clausen: Leafl. W. Bot. 5: 145. (1949)
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